My sister and I planned to meet at WL today (a Monday) for lunch at Geyser Point, coming from separate directions which is why we arrived separately. I arrived at 12:20, pulled up and the guard asked if I was checking in or dining. I said I was there for lunch at GP, he asked for photo ID, then said "you're all set" and I drove in and parked.
Ten minutes later, my sister phoned from the guard kiosk - he told her she could not enter without an ADR. I said that Geyser Point did not take ADRs, and that I had just been permitted to enter without a problem. He repeated that she could not enter but after a little pleading, since I was already inside, he allowed her to enter but made sure she knew that he was going above and beyond and really doing her a favor! From our description of the CM, it sounded like it was the same one who was at the post for both of us.
It was not busy at all - GP was more than half empty and the resort did not appear particularly full. I get that it's policy, but the inconsistency within 10 minutes was a bit frustrating. She even has a handicap hangtag (which I don't have) so would have had a more difficult time managing an alternative route than me, had she been directed elsewhere.